How to convert char buffer (with pcm audio data) to short buffer?

The use of atoi() with the address of the variables is entirely mistaken and incorrect. That is for converting the ASCII representation of a value into a number. In your case, you don't really have a buffer of "characters" but rather a buffer of byte values, which under the history of C is commonly implemented with the char type rather than something more recent and definitive such as int8_t .

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